Ceria nanocrystallites with different morphologies and crystal planes were hydrothermally prepared, the effects of ceria supports on physicochemical catalytic properties Pd/CeO2 for CO propane oxidation examined. The results showed that structure chemical state Pd affected by planes. species CeO2-R (rods) CeO2-C (cubes) mainly formed PdxCe1–xO2−σ solid solution −Pd2+–O2––Ce4+– linkage. In addition, PdOx nanoparticles dominated surface Pd/CeO2-O (octahedrons). For oxidation, Pd/CeO2-R...

Sm-Mn mixed oxide catalysts prepared by the coprecipitation method were developed, and their catalytic activities tested for selective reduction (SCR) of NO with ammonia at low temperature. The results showed that amount Sm markedly influenced activity MnOx catalyst SCR, exhibited a volcano-type tendency an increase in content, appropriate mole ratio to Mn was 0.1. In addition, presence can obviously enhance both water sulfur dioxide resistances. effect on physiochemical properties Sm-MnOx...

Co3O4 supported on ZSM-5 (Co3O4/ZSM-5) catalysts were prepared by impregnation (IM), deposition precipitation (DP), and hydrothermal (HT) methods. Their catalytic performances for the total oxidation of propane tested, their physicochemical properties investigated low-temperature N2 adsorption, XRD, FT-IR absorption spectroscopy, XPS, H2-TPR, TEM, CO chemisorption. The results show that activity Co3O4/ZSM-5 is higher than 1.5 wt % Pd/ZSM-5, preparation methods remarkably affect Co3O4/ZSM-5....

Tailoring the interfaces between active metal centers and supporting materials is an efficient strategy to obtain a superior catalyst for certain reaction. Herein, interface Ru CeO2 was identified constructed by adjusting morphology of support, such as rods (R), cubes (C), octahedra (O), optimize both activity stability Ru/CeO2 propane combustion. We found that support does not significantly affect chemical states species but controls interaction CeO2, leading tuning oxygen vacancy in...

The doping of In2O3 significantly promoted the catalytic performance Co3O4 for CO oxidation. activities In2O3–Co3O4 increased with an increase in content, form a volcano curve. Twenty-five wt % (25 InCo) showed highest oxidation activity, which could completely convert to CO2 at temperature as low −105 °C, whereas it was only −40 °C over pure Co3O4. induced expansion unit cell and structural distortion Co3O4, confirmed by slight elongation Co–O bond obtained from EXAFS data. red shift UV–vis...

Density-functional theory calculations have been carried out to systematically study single surface oxygen vacancies on ${\text{CeO}}_{2}(111)$. It is surprisingly found that multiple structures with the two excess electrons localized at different positions can exist. We show origin of multiconfigurations $4f$ a result geometric relaxation and strong localization characteristic in ceria. The importance electron also presented discussed. These results may possess implications for our...

Pd/H-ZSM-5 catalysts could completely catalyze CH4 to CO2 at as low 320 °C, while there is no detectable catalytic activity for pure H-ZSM-5 °C and only a conversion of 40% be obtained 500 over H-ZSM-5. Both the theoretical experimental results prove that surface acidic sites facilitate formation active metal species anchoring sites, which further modify electronic coordination structure species. PdOx interacting with Brönsted acid exhibit Lewis acidity lower oxidation states, proven by XPS,...

Supported gold (Au) nanocatalysts hold great promise for heterogeneous catalysis; however, their practical application is greatly hampered by poor thermodynamic stability. Herein, a general synthetic strategy reported where discrete metal nanoparticles are made resistant to sintering, preserving catalytic activities in high-temperature oxidation processes. Taking advantage of the unique coating chemistry dopamine, sacrificial carbon layers constructed on material surface, stabilizing...

Abstract The design and synthesis of robust sintering-resistant nanocatalysts for high-temperature oxidation reactions is ubiquitous in many industrial catalytic processes still a big challenge implementing nanostructured metal catalyst systems. Herein, we demonstrate strategy designing through support via compartmentalization. Ultrafine palladium active phases can be highly dispersed thermally stabilized by nanosheet-assembled γ-Al 2 O 3 (NA-Al ) architectures. NA-Al architectures with...

Ruthenium (Ru) nanoparticles (∼3 nm) with mass loading ranging from 1.5 to 3.2 wt % are supported on a reducible substrate, cerium dioxide (CeO2, the resultant sample is called Ru/CeO2), for application in catalytic combustion of propane. Because unique electronic configuration CeO2, strong metal-support interaction generated between Ru and CeO2 stabilize oxidation reactions well. In addition, host high oxygen storage capacity can provide an abundance active redox thus greatly increases...

Nanosized MnO2 particles with α-, β-, γ-, and δ-crystal phases were synthesized hydrothermally, characterized by XRD, SEM, HR-TEM, low temperature N2 adsorption, TPR, TPD, FT-IR Raman spectroscopy. The density functional theory (DFT) method was used to calculate the adsorption of propane O2 on catalysts. effect crystal or plane figure catalytic properties for total oxidation evaluated. results showed that β- γ-MnO2 exhibited a 1D structure, δ-MnO2 2D layered-structure material. For deep...

Controlling the physical and chemical properties of alloy nanoparticles (NPs) is an important approach to optimize NP catalysis. Unlike other tuning knobs, such as size, shape, composition, crystal structure has received limited attention not been well understood for its role in This deficiency mainly due difficulty synthesis fine-tuning NPs' structure. Here, Exemplifying by AuCu NPs with face centered cubic (fcc) tetragonal (fct) structure, we demonstrate a remarkable difference phase...

Ru catalysts have attracted increasing attention in catalytic oxidation of chlorinated volatile organic compounds (CVOCs). However, the development with high activity and thermal stability for CVOC still poses significant challenges due to their restrictive relationship. Herein, a strategy constructing surface defects on Co3O4 support by acid etching was utilized strengthen interaction between active RuOx species support. Consequently, both dispersity were significantly improved, achieving...

Pt-based catalysts have attracted widespread attention in environmental protection applications, especially the catalytic destruction of light alkane pollutants. However, developing a satisfying platinum catalyst with high activity, excellent water-resistance, and practical suitability for hydrocarbon combustion at low temperature is challenging. In this study, Pt supported on selected Nb2O5 oxide exhibited an efficient activity propane oxidation exceeded that most reported literature. More...

Developing efficient catalysts for the total oxidation of light alkane at low temperatures is challenging. In this study, superior catalytic performance in was achieved by modulating acidity and redox property a Pt/CeO2 catalyst through phosphorus modification. Surface modification with resulted electron withdrawal from Pt, leading to platinum species high valency generation Brönsted acid sites, increased catalyst. Consequently, ability activate C-H bond increasing P content owing...

Precise determination of the structure-property relationship zeolite-based metal catalysts is critical for development toward practical applications. However, scarcity real-space imaging low-atomic-number (LAN) materials due to electron-beam sensitivity zeolites has led continuous debates regarding exact LAN configurations. Here, a low-damage high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) technique employed direct visualization and (Cu) species in ZSM-5...

Crystal engineering of metal oxide supports represents an emerging strategy to improve the catalytic performance noble catalysts in oxidation chlorinated volatile organic compounds (CVOCs). Herein, Pt on a TiO2 support with different crystal phases (rutile, anatase, and mixed phase (P25)) were prepared for 1,2-dichloroethane (DCE). The catalyst P25-TiO2 (Pt/TiO2-P) showed optimal activity, selectivity, stability, even under high-space velocity humidity conditions. Due strong interaction...

Short carbon chain alkanes, as typical volatile organic compounds (VOCs), have molecular structural stability and low polarity, leading to an enormous challenge in the catalytic oxidation of propane. Although Ru-based catalysts exhibit a surprisingly high activity for propane CO2 H2O, active RuOx species are partially oxidized sintered during reaction, decrease significantly inhibiting their application industrial processes. Herein, Ru/Ce@Co catalyst is synthesized with specific structure,...